/*
 * jPOS Project [http://jpos.org]
 * Copyright (C) 2000-2015 Alejandro P. Revilla
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.jpos.iso.channel;

import org.jpos.iso.*;

import java.io.IOException;
import java.net.ServerSocket;

/**
 * Implements an ISOChannel capable to exchange messages with
 * ACI's BASE24[tm] over an X.25 link.
 * <p/>
 * An instance of this class exchanges messages by means of an
 * intermediate 'port server' as described in the
 * <a href="/doc/javadoc/overview-summary.html">Overview</a> page.
 *
 * @author apr@cs.com.uy
 * @version $Id$
 * @see ISOMsg
 * @see ISOException
 * @see ISOChannel
 */
@SuppressWarnings("deprecation")
public class BASE24Channel extends BaseChannel {
	/**
	 * Public constructor (used by Class.forName("...").newInstance())
	 */
	public BASE24Channel() {
		super();
	}

	/**
	 * Construct client ISOChannel
	 *
	 * @param host server TCP Address
	 * @param port server port number
	 * @param p    an ISOPackager
	 * @see ISOPackager
	 */
	public BASE24Channel(String host, int port, ISOPackager p) {
		super(host, port, p);
	}

	/**
	 * Construct server ISOChannel
	 *
	 * @param p an ISOPackager
	 * @throws IOException
	 * @see ISOPackager
	 */
	public BASE24Channel(ISOPackager p) throws IOException {
		super(p);
	}

	/**
	 * constructs a server ISOChannel associated with a Server Socket
	 *
	 * @param p            an ISOPackager
	 * @param serverSocket where to accept a connection
	 * @throws IOException
	 * @see ISOPackager
	 */
	public BASE24Channel(ISOPackager p, ServerSocket serverSocket)
			throws IOException {
		super(p, serverSocket);
	}

	/**
	 * @param m   the Message to send (in this case it is unused)
	 * @param len message len (ignored)
	 * @throws IOException
	 */
	protected void sendMessageTrailler(ISOMsg m, int len) throws IOException {
		serverOut.write(3);
	}

	/**
	 * @return a byte array with the received message
	 * @throws IOException
	 */
	protected byte[] streamReceive() throws IOException {
		int i;
		byte[] buf = new byte[4096];
		for (i = 0; i < 4096; i++) {
			int c = serverIn.read();
			if (c == 0x3)
				break;
			buf[i] = (byte) c;
		}
		if (i == 4096)
			throw new IOException("message too long");

		byte[] d = new byte[i];
		System.arraycopy(buf, 0, d, 0, i);
		return d;
	}
}
